Bolshoi Semiachik

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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 54.32°N
  • 160.02°E

  • 1720 m
    5642 ft

  • 300150
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Bolshoi Semiachik.

The Global Volcanism Program has no Weekly Reports available for Bolshoi Semiachik.

The Global Volcanism Program has no Bulletin Reports available for Bolshoi Semiachik.

Volcano Types

Lava dome(s)

Tectonic Setting

Subduction zone
Continental crust (> 25 km)

Rock Types

Basalt / Picro-Basalt
Andesite / Basaltic Andesite


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

The Bolshoi Semiachik volcanic complex was constructed within a 10-km-wide caldera whose rim is exposed only on the west. The caldera occupies a large 20 x 30 km late-Pleistocene volcano-tectonic depression near the Pacific Coast of eastern Kamchatka. Post-caldera volcanism includes resurgent doming and the construction of numerous stratovolcanoes and lava domes, several of which have been active during the Holocene. Zubchatka (Bolshoi Semiachik), Zapadny Barany, Vostochny Barany, Zentralny Semiachik, Popkov, Plosky, and Burlyashchy volcanoes are the largest of the volcanic complex. The youngest volcanism and intense modern hydrothermal activity, which is among the most vigorous of Kamchatka, is located outside the caldera to the SE.

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
4450 BCE (?) Unknown Confirmed   Radiocarbon (corrected) Korona and Yezh lava domes
6800 BCE ± 300 years Unknown Confirmed   Radiocarbon (uncorrected) Ivanov lava dome

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Bol'shoy Semyachik | Kikhpinych


Feature Name Feature Type Elevation Latitude Longitude
Bort Stratovolcano
Stratovolcano 1000 m 54° 16' 0" N 160° 0' 0" E
Dalny Cone
Malen'ky Cone
Plosko-Kruglen'ky Cone
Plosky Stratovolcano
Popkov Stratovolcano
Problematichny Cone 1317 m
Vostochny Barany Stratovolcano 1320 m
Zapadny Barany Stratovolcano 1426 m
Zentralny Semiachik
    Tsentralnyy Semiachik
Stratovolcano 1100 m 54° 16' 0" N 159° 59' 0" E
Zubchatka Stratovolcano 1720 m 54° 19' 0" N 160° 1' 0" E


Feature Name Feature Type Elevation Latitude Longitude
Cherny Dome
Goryachy Dome
Ivanov Dome
Korona Dome
Krutoi Dome
Kulakov Dome
Kupol Skalisty Dome
Opalny Dome
Ovalnye Dome
Peremychka Dome
Polukupol Dome


Feature Name Feature Type Elevation Latitude Longitude
Chernoye Lake Thermal
Paryashchaya Dolina Thermal
Verkhneye Thermal Field Thermal

Photo Gallery

Bolshoi ("Big") Semiachik is a group of Late Pleistocene-Holocene stratovolcanoes and extrusive domes located within a large caldera. The massif is seen here from the western rim of the caldera (Bort ridge). Bolshoi Semiachik (Zubchatka or Zubchatyi) volcano per se is the large Late-Pleistocene edifice on the left-center horizon. Several Holocene extrusive domes and vigorously active thermal fields are located west and SW of the volcano.

Copyrighted photo by Nikolai Smelov (Holocene Kamchataka volcanoes;


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.

Erlich E N, 1986. Geology of the calderas of Kamchatka and Kurile Islands with comparison to calderas of Japan and the Aleutians, Alaska. U S Geol Surv Open-File Rpt, 86-291: 1-300.

Fedotov S A, Masurenkov Y P (eds), 1991. Active Volcanoes of Kamchatka. Moscow: Nauka Pub, 2 volumes.

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Kozhemyaka N N, 1995. Active volcanoes of Kamchatka: types and growth time of cones, total volumes of erupted material, productivity, and composition of rocks. Volc Seism, 16: 581-594 (English translation).

Ponomareva V V, 1992. . (pers. comm.).

Vlasov G M, 1967. Kamchatka, Kuril, and Komandorskiye Islands: geological description. In: {Geol of the USSR}, Moscow, 31: 1-827.

Vlodavetz V I, Piip B I, 1959. Kamchatka and Continental Areas of Asia. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 8: 1-110.

Affiliated Databases

Large Eruptions of Bolshoi Semiachik Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
Smithsonian Collections Search the Smithsonian's NMNH Department of Mineral Sciences collections database. Go to the "Search Rocks and Ores" tab and use the Volcano Name drop-down to find samples.